proposal: math: add constant `Euler`

[Guest-615695028]

Such constant Euler is seen in src/math/gamma.go, line 132.

const Euler = 0.57721566490153286060651209008240243104215933593992 // A001620

[gabyhelp]

Related Issues

• proposal: math: Add Euler-Mascheroni constant #24759 (closed)

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[adonovan]

This proposal is identical to #24759, which was closed on the basis that no constants missing from the math package are important enough to be added at this point. I don't see any sign that the situation has changed, so I'm going to close this proposal.